Introduces new named constants for the colour palette, with entries for low colours, all greys (both greyscale and high colours), and the pure primary and secondary high colours.
Coverage remained the same at 95.091% when pulling 11f0c3bea4e4bc8202e74808d3f319500f41580e on more-accessible-colour-palette#188 into dc1960f7add25ca1d782ce3b793e270ede2c98f5 on master.
Introduces new named constants for the colour palette, with entries for low colours, all greys (both greyscale and high colours), and the pure primary and secondary high colours.
Closes #188.
This change is